The identity of Viola curvicalcarata W. Becker & H. Boissieu (Bull. Herb. Boissier, sér. 2, 8: 740. 1908), described from Shaanxi, cannot be ascertained in this treatment because we have not seen any specimens of it.

About 550 species: cosmopolitan, chiefly in temperate regions of the N hemisphere; 96 species (35 endemic, three introduced) in China.